南蒙古古生代岛弧地体中酸性岩石锆石年代学、Hf同位素特征及地质意义

张伟波; 王丰翔; 刘翼飞; 江思宏; 何学洲; 于瑞; 李谦谦

doi:10.3799/dqkx.2021.197

Volume 47 Issue 8

Sep. 2022

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Zhang Weibo, Wang Fengxiang, Liu Yifei, Jiang Sihong, He Xuezhou, Yu Rui, Li Qianqian, 2022. Zircon Geochronology and Hf Isotope of Intermediate Acidity Magmatic Rocks in the Island Arc Terrane of South Mongolia and Their Geological Significance. Earth Science, 47(8): 2824-2838. doi: 10.3799/dqkx.2021.197

Citation:

Zhang Weibo, Wang Fengxiang, Liu Yifei, Jiang Sihong, He Xuezhou, Yu Rui, Li Qianqian, 2022. Zircon Geochronology and Hf Isotope of Intermediate Acidity Magmatic Rocks in the Island Arc Terrane of South Mongolia and Their Geological Significance. Earth Science, 47(8): 2824-2838. doi: 10.3799/dqkx.2021.197

Citation:

Zhang Weibo, Wang Fengxiang, Liu Yifei, Jiang Sihong, He Xuezhou, Yu Rui, Li Qianqian, 2022. Zircon Geochronology and Hf Isotope of Intermediate Acidity Magmatic Rocks in the Island Arc Terrane of South Mongolia and Their Geological Significance. Earth Science, 47(8): 2824-2838. doi: 10.3799/dqkx.2021.197

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Zircon Geochronology and Hf Isotope of Intermediate Acidity Magmatic Rocks in the Island Arc Terrane of South Mongolia and Their Geological Significance

doi: 10.3799/dqkx.2021.197

Zhang Weibo^{1, 2
,
,},
Wang Fengxiang^{1, 3},
Liu Yifei¹,
Jiang Sihong^{1
,
,
,},
He Xuezhou²,
Yu Rui²,
Li Qianqian⁴

1.
MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China
2.
Development Research Center, China Geological Survey, Beijing 100037, China
3.
Hebei Key Laboratory of Strategic Critical Mineral Resources, Hebei GEO University, Shijiazhuang 050031, China
4.
Hebei Prospecting Institute of Hydro-Engineering Geology, Shijiazhuang 050021, China

Received Date: 2021-08-11
Publish Date: 2022-09-25

Abstract

Abstract

The Mandalovoo⁃Gurvansaikhan island⁃arc Terrane in South Mongolia is an important part of Central Asian Orogenic Belt (CAOB). In order to constrain the genetic relationship between the large⁃scale magmatism, porphyry⁃type Cu⁃polymetallic mineralization and regional crustal evolution, petrography, LA⁃MC⁃ICP⁃MS zircon geochronology and Hf⁃isotop were completed on the typical deposits. Based on geological evidence, the metallogenic⁃related rocks at Kharmagtai Cu⁃Au deposit is the andesite⁃monzodiorite porphyritem, and the LA⁃ICP⁃MS zircon U⁃Pb dating of them yields crystallization age of 332 to 324 Ma. The monzonitic granite hosting the Tsagaan Suvarga Cu⁃Mo ore⁃bodies and the diorite granodiorite porphyry related to Bronze Fox porphyry⁃type mineralization yield crystallization age of ~372 Ma and ~333 Ma respectively. The monzonite intrusions and andesite⁃granodiorite complexes at Oyut Ulaan were emplaced at ~381 Ma and 338 to 332 Ma. Based on geological evidence, and chronology data, the Late Paleozoic magmatic activity at Mandalovoo⁃Gurvansaikhan island⁃arc Terrane is mainly divided into three stages: 383 to 369 Ma, 367 to 363 Ma and 338 to 321 Ma. Among them, the metallogenic⁃related magmatic active are mainly concentrated in two periods of 375 to 369 Ma and 338 to 328 Ma, which may be the two most important mineralization periods in the region. Moreover, the in⁃situ zircon ε_Hf(t) show positive values between +7.85 to +16.14, which are above the chondrite evolution line, partial sample are markedly close to the depleted mantle (DM) evolution line, indicating that the source of the diagenetic material may be the new material formed by the DM partial⁃melting, and the new material subject to partial melting after a short stay in the crust, mixed with a certain amount of mature crust. The t_DM2 are 331~717 Ma, indicating that the time of important crustal accretion events in region is from Neoproterozoic to Late Paleozoic.
- South Mongolia,
- island arc,
- intermediate acidity magmatic rocks,
- geochronology,
- Hf zircon isotope,
- porphyrydeposits

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